Environment:
Eclipse 3.7 Indigo, Maven 2/3 + default M2E , GWT Eclipse plugin 2.4
Go to the GWT SDK folder, type this:
webAppCreator.cmd -out d:\workspace-Eclipse\gwtTest -maven com.mystic.gwtTest
Then import to eclipse as “Existing Maven projects”
There are many other way to create GWT in maven, but most of them just NOT working with eclipse 3.7 due to the M2e problem. (You need to study on them before u can figure out what happen)
Like those GWT samples project or GWT maven plugin